Muwatta Malik #412
Shortening the Prayer
Yahya related to me from Malik from Nafi that Abdullah ibn Umar
used to say, "Someone who only remembers that he has forgotten a
prayer when he is praying the next prayer behind an imam, should pray
the prayer he has forgotten after the imam has said the taslim, and
then pray the other one again."
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About Muwatta Malik
This hadith is #412 from Muwatta Malik, in the Book of Shortening the Prayer. Muwatta Malik contains 1,985 hadiths across 61 books.